What is the equation of Bo's Capital Allocation Line?

Q3. Your client, Bo Regard, holds a complete portfolio that consists of a portfolio of risky assets (P) and T-Bills. The information below refers to these assets E (Rp) Standard Deviation of P T-Bill rate 12.00% 7.20% 3.60% Proportion of complete Portfolio in P Proportion of complete Portfolio in T-Bills 80% 20% Composition of P: Stock A Stock B Stock C Total 40.00% 25.00% 35.00% 100.00%